Learn About
Cased CFA
The main application for drilling with a Cased CFA is to build Secant Walls, as
opposed to diaphragm walls. The main advantages are:
- Eliminates the need to use bentonite mud which is accompanied by the costs and inconvenience of large mud plants, handling, and dirt resulting in the work.
- Improved accuracy of verticality, guaranteeing a maximum deviation 1.5%.
- Quick and clean concreting. In underwater concreting of diaphragm walls, the concrete trucks are parked for a long time in difficult areas due to the time needed for this operation.
- Eliminates need for service crane on the jobsite.
- Best finish surfaces of the cuttings, because they are made with the casing which works as a mold.
- Can be performed in smaller jobsites, and there is no spaced needed for bentonite mud mixers, pumps and tanks.
- Soil disposal not contaminated by mud is much easier to discard.
- Better sealing between the joints, as the piles are secant.
- Significantly more productive than secant walls made with Kelly bar drill rigs.
- Cost effective process when compared to either Grabs for diaphragm walls or Cased Kelly bar drilling for secant walls.
| Standard Chassis: | CAT 352 Tier IV | |
| Installed Power: | 432 hp | 322 kW |
| Maximum Diameter: | 36 in | 920 mm |
| Drilling Depth (Auger Only): | 66 ft | 20,200 mm |
| Casing Rotary Head Maximum Torque: | 155,080 ft.lbs | 21,500 kg.m |
| Auger Rotary Head Maximum Torque: | 101,400 ft.lbs | 14,000 kg.m |
| Operation Weight: | 230,000 lb | 104,500 kg |
| Standard Chassis: | CAT 336 Next Gen | |
| Installed Power: | 323 hp | 242 kW |
| Maximum Diameter: | 36 in | 920 mm |
| Maximum Depth: | 66 ft | 20,200 mm |
| Casing Rotary Head Maximum Torque: | 155,080 ft.lbs | 21,500 kg.m |
| Auger Rotary Head Maximum Torque: | 101,400 ft.lbs | 14,000 kg.m |
| Operation Weight | 180,000 lb | 81,800 kg |